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  2. Room modes - Wikipedia

    en.wikipedia.org/wiki/Room_modes

    Room modes are the collection of resonances that exist in a room when the room is excited by an acoustic source such as a loudspeaker. Most rooms have their fundamental resonances in the 20 Hz to 200 Hz region, each frequency being related to one or more of the room's dimensions or a divisor thereof. These resonances affect the low-frequency ...

  3. House plan - Wikipedia

    en.wikipedia.org/wiki/House_plan

    Elevation view of the Panthéon, Paris principal façade Floor plans of the Putnam House. A house plan [1] is a set of construction or working drawings (sometimes called blueprints) that define all the construction specifications of a residential house such as the dimensions, materials, layouts, installation methods and techniques.

  4. Bed size - Wikipedia

    en.wikipedia.org/wiki/Bed_size

    In Turkey, single size beds are usually 90 cm × 190 cm (35 in × 75 in); long single size 90 cm × 200 cm (35 in × 79 in); large single size 100 cm × 200 cm (39 in × 79 in). There is also an intermediate size used for one and a half people [clarification needed] in Turkey: 120 cm × 200 cm (47 in × 79 in).

  5. Room acoustics - Wikipedia

    en.wikipedia.org/wiki/Room_acoustics

    After determining the best dimensions of the room, using the modal density criteria, the next step is to find the correct reverberation time. The most appropriate reverberation time depends on the use of the room. RT60 is a measure of reverberation time. [9] Times about 1.5 to 2 seconds are needed for opera theaters and concert halls.

  6. Lumen method - Wikipedia

    en.wikipedia.org/wiki/Lumen_method

    The CU value should be obtained by the manufacturer of the luminaire which is to be evaluated. In order to determine the CU on the manufacturer's table, a room cavity ratio (RCR) must be used. Also, the reflectance of the ceiling, walls and floor must be known. RCR = 5 x (room height) x (room width + room length) / [(room width) x (room length ...

  7. Basic dimension - Wikipedia

    en.wikipedia.org/wiki/Basic_dimension

    In a technical drawing, a basic dimension is a theoretically exact dimension, given from a datum to a feature of interest. In Geometric dimensioning and tolerancing , basic dimensions are defined as a numerical value used to describe the theoretically exact size, profile, orientation or location of a feature or datum target.

  8. Engineering tolerance - Wikipedia

    en.wikipedia.org/wiki/Engineering_tolerance

    Summary of basic size, fundamental deviation and IT grades compared to minimum and maximum sizes of the shaft and hole. Dimensional tolerance is related to, but different from fit in mechanical engineering, which is a designed-in clearance or interference between two parts.

  9. Aspect ratio - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio

    The aspect ratio of a geometric shape is the ratio of its sizes in different dimensions. For example, the aspect ratio of a rectangle is the ratio of its longer side to its shorter side—the ratio of width to height, [1] [2] when the rectangle is oriented as a "landscape".